Removing synchronous ajax as planned deprecation is a bad idea

Well that wasn't a question, but I have some serious misgivings about your proposed idea to get rid of synchronous ajax. Your site says:
Note: Starting with Gecko 30.0 (Firefox 30.0 / Thunderbird 30.0 / SeaMonkey 2.27), synchronous requests on the main thread have been deprecated due to the negative effects to the user experience.
As a simple developer of web forms, I assume that I am using the "main thread" and will be affected. Some of my forms are built dynamically and data is sometimes fetched dynamically as well. If I open a form for a user I may need to pre-populate the form fields with some data. In that case, I'd have to get the data (via synchronous ajax) before showing the form. This is a simple case and I think a common one. Am I missing something or am I just screwed?

See:
*https://developer.mozilla.org/Mozilla/Firefox/Releases/30/Site_Compatibility
It hasn't been removed in Firefox 30, but is merely tagged as deprecated
<blockquote>Synchronous XMLHttpRequest has been deprecated
* Bug 969671 – Warn about use of sync XHR in the main thread
The async argument of the XMLHttpRequest constructor is true by default, and false makes the request synchronous. Developers now get an warning in the Web Console if a synchronous request is used on the main thread, or the outside of workers, since it's now considered deprecated due to the negative effects to the user experience.</blockquote>

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